Danny Sullivan did some information seeking and confirmed Firefox has intentions to release this as the default Google search behavior in the near future, as long as the tests go well. Firefox told him:

We are currently testing the change to use SSL for built-in Google searches in our Firefox nightly channel. If no issues are uncovered, it will move through our Aurora and Beta release channels before eventually shipping to all our Firefox users. This will include migrating the changes to our non-English version of Firefox, as well.

What this means for SEOs and webmasters, as well as marketers, is that the "Not Provided" in your analytics "keyword" reports will just increase. Right now, I am at about 30% of all my keyword data says "not provided." I wouldn't be surprised if that jumps to 40 or 50% once this is rolled out.

Danny gets more into the hypocrisy of this change, as well as the impact it will have on everyone.

A WebmasterWorld thread has some early reaction from the webmaster community: